Diversity of Natural Enemy in Cassava Fields in Thongsaenkan District, Uttaradit Province

Abstract

This research aims to study the diversity of pests in the cassava area, Tongsankan district, Uttaradit province. The study was conducted from December 2016 - November 2017 dividing to 4 periods: period 1 December 2016 to February 2017, period 2 March to May 2017, period 3 June to August 2017 and period 4 September to November 2017 by examining the diversity of natural enemy by using a sweep net and a manual sampling. Then classified the species of in Order and Family under the Stereo microscope. The study was found that in the period 1, 4 Orders and 7 Families’ natural enemy were found, 4 Orders and 12 Families’ natural enemy in period 2, 5 Orders and 9 Families’ natural enemy in period 3, 2 Orders and 12 Families’ natural enemy in period 4. There were 6 Orders and 18 Families of insect pest in each month as follows: Order Coleoptera, Order Diptera, Order Hemiptera, Order Hymenoptera, Order Odonata and Order Orthotera. The data were analyzed by using biodiversity index (H '), consistency index (J') and diversity index (D) in the period from December 2016 to February 2017, March to May 2017, June to August 2017 and September to November 2017. The results of the biodiversity index analysis (Shannon-Wiener’s index, H’) of natural enemy were 1.159, 2.435, 1.448 and 1.355, respectively. The consistency index (J') were 0.595, 0.922, 0.603 and 0.528, respectively. And the diversity index (D) were 0.546, 0.896, 0.666 and 0.532, respectively. From the results, the analysis of the diversity of natural enemy in this cassava area can be used as a preliminary data to guide the planning of local insect pests in the next biological control